Anatomy & Cell Biology

Table 2

Codes used to classify dental characteristics in this study

Code	Description
V (virgin tooth)	No evidence of dental disease, treatment, or anatomical abnormality
X (missing tooth)	Extracted or congenital missing tooth
I (impacted tooth)	Unerupted or impacted tooth
D (defect)	Defect by dental caries, tooth fracture or fallen-out fillings
R (residual root)	Remained root due to severe dental caries or trauma
T (root canal treatment)	Root canal-filled tooth by endodontic treatment
F (filling)	Filled tooth with any kind of restoration
P (prosthesis)	Tooth with full-veneer crown
L (dental implant)	Dental implant inserted into an edentulous area

The contents of this table were modified from the study by Lee et al. [25].